In a speck of watery material smaller than the dot over this i, all the future characteristics of the child are programmed—the color of his skin, eyes and hair, the shape of his facial features, the natural abilities he will have. All that the child will be physically and mentally is contained in germ form in that fertilized egg. From it will develop: 60 trillion cells, 100 thousand miles of nerve fiber, 60 thousand miles of vessels carrying blood around the body, 250 bones, to say nothing of joints, ligaments and muscles.
(Source: MacDonald, W., & Farstad, A. 1997, c1995. Believer’s Bible Commentary : Old and New Testaments (Ps 139:13). Nashville: Thomas Nelson. From a sermon by Matthew Krantz, "God is Omnipotent" 7/20/08)